Sharpener for slicing machines



y 19-32. J. N; WOODINGTON ,42

SHARPENER' FOR SLICING MACHINES Filed May 12. 1927 7 Sheets-Sheet l May 10, 1932. J. N. WOODINGTON SHARPENER FOR SL ICING MACHINES Filed May 12. 1927 Sheets-Sheet 2 y 10, 1932- J. N. WOODINGTON 1,857,421

SHARPENER FOR SLICING' MACHINES Filed May 12. 1927 'r Sheets-Sheet May 10, 1932. J. N. WOODINGTON SHARPENER FOB :SLICING MACHINES I y 0,- 1932. J. N. WOODINGTON 2 SHARPENER FOR SLI CII JG MACHINES Filed May 12. 1927 7 Sheets-Sheet 5 kfrzuenfor W 00 (re @pywflgw iy y 932. J. N. IWOODINGTON 1,857,421

SHARPENER FOR SLICING MACHINES Fiied May 12. 1927 7 Sheets-Sheet 6 Jwerzfu" JOHN N. WOODINGTON, or LA roars, INDIANA, nssre on' TO ,U. s. snrorNe MACHINE thereto;

Patented May 10, 1932 UNITED STATES.

COMPANY, OF LA FORTE, INDIANA, A CORPORATION INDIANA SHARPENER FOR sLIoINGMAoHINEs v Application filed May 12 This invention relates to mechanism for sharpening the rotary circular knives of ma chines for slicing meat or other material, and has for one of its objects the provision of a sharpener having stones for grinding the bevel of one side of the slicing knife and for removing the burr formed at the opposite side of the knife, together with operating mechanism for the stones which shall require the m stones to operate in proper sequence to give the best results.

A further'object is to provide a mounting for the grinders which is movable into and out of operative position relative to the knife without injury to the edge of the knife.

j. ularly pointed out in the appended claims.

In the drawings- Fig. 1 is a vertical sectional view of a knife sharpener showing one embodiment of the present invention; Q j

Fig. 2 is a rear elevation of the sharpener shown in Fig. 1, with parts in section;

Fig. 3 is a top plan view of the mechanism shown'in Figs. 1 and 2, with parts, broken away; i

Fig. 4 is a section on line 44 of Fig. 2;

Fig. 5 is a section on line 55 of Fig. 1;

Fig. 6 is a fragmentary view showing the stones in projected position but out of operative relation to the knife;

Fig. 7 is a fragmentary sectional view of a modified form of control for the grinding stones; j

Fig. 8 is a section on line 88 of Fig. 7

Fig. 9 is an elevation of the spring detent as shown in Figs. 7 and 8; V p

Fig. 10 is a section on line 10 of Fig-3;

Fig. 11 is an elevation, with parts. in sec tion, showing a portion ofa slicing machine having anotherform of the invention applied from the fol- 1927. Serial o. 190,758."

I. FigJ12 is a section substantially on line 1212-of Fig.11;

'Fig. 13 is a section substantially on line 1313 of Fig. 11; 1 Fig. 1 1 is a top ener, with a part of the casing broken away and 1 Fig. is a section on line 15 15 of Fig. 14.

planview of the sharp- 'In grinding the rotary circular knives of U edge of the knife morethan once after the grinding operation has been completed and the grinding stone should not be permitted to engagel the edge of the knife to produce a further burrafter the finishingstone has passed along theknife edge. The present invention provides means for compelling proper sequence of the operation of the two stones and for avoiding injury to the edge *after'it has been formed.

Referring first to Figs 1 to the numeral 10 designates the'bearing of a slicing machine having a rotarycircular disc knife 11 journaled thereon. A casing 12 is mounted onthe bearing 10and is provided 6,'inclusive,

with sleeves 13 and 14 supported on the front wall 15 of the housing12. Bushings 16 and 17are slidably mounted in the sleeves 13 and 14, respectively, and spindles 18 and 19 are journaled in the bushings 16and 17', respec-.

tive'l'y." The spindle 18 carries a grinder 20 at its forward end disposed at the'proper angle to engage the beveled face of the knife 11 for sharpening the edge of the knife. The

spindle 19 carries the finishing stone 21. A spring 22 tends to project the stone 20 toward the knife 11 and a spring 23 tends to retract the stone 21' toward theknife'll; A shaft 24 is ournaled in lugs 25 on the sleeves 13 and l tfand is provided with cam fingers 26 and 27for engaging pins 28and 29 secured H tolth'e bushings 16 and 17,- respectively; "A

22 and 23. When the shaft 24is free to rotate I under the force of the spring 30 therefor the grinding stones 20 and 21 will be withdrawn from engagement with the knife 11 by theaction of this spring through the cam fingers hand wheel 32 and is pressed against the face 26 and 27 The end of the shaft 24 projects from the casing 12, as shown in Fig.2, and is provided with a hand wheel 32 by means of which the shaft may be rotated against the force of the spring 30.' The hand wheel 32 is secured to the end of the shaft 24 by means of a pin 33.

. Aratchet wheel 34 is slidably mounted on the shaft 24 adjacentxthe inner side of the of the hand-wheel by a spring 35. 'As shown in Figs. 2 and.4, the'ratchet wheel 34 is provided with a circumferential flange 36 having notches 37and 38' therein. A detent 39 is arranged'to engage the notches 37 and38 to hold the shaft-24 against rotation under the force of-the spring 30. The ratchet wheel 34 is provided with a reduced portion 40 immediately adjacent the flange36, the surface of the'reduced portion being flush with the bottomof the notches 37 and 38. A pair of pins 41 are secured to the ratchet wheel 34 and are slidably mounted in perforations in the hub portion 42 of the hand wheel 32. The outer ends of the pins 41 carrya push button 43. VVhen' the button 43is pressed inwardly against the force of the spring 35, the ratchet wheel 34will be slid inwardly to bring the reduced portion-40 into registration with the detent 39. Itis apparent that this will free the ratchet wheel from the detent 39 and immediately release the shaft 24 and permit it to rotate-under, the force of the sp'ringBO.

1' In operating the device tofsharpenthe knife 11, starting with the parts in position I 7 shown in Fig. "1, the hand wheel 32 will be roi cam fingers 26'iare'so located that the first tated ina counter-clockwise direction and the effect will be to release the bushing 16 and permit the spring-22 tomove the stone 20 into grinding contact with the beveledcdge I of the knife 11. The knife 11 is then rotated with the notch 37in the ratchet wheel34.

After the knife has been properly sharpened v the hand wheel 32 is furtherrotated to bring the notch 38 into engagement with the detent 39.2" This will cause thestone 21 to engage 'the straight side of the knife edge and remove the burrforme'd byithe grinder 20. The grinding operation can he continued with the parts in this position, if desired, for the stone v21 will continue to remove the burr formed while the stones are in this position. The detent 39 prevents the operator from reversely rotating the hand wheel 32' to release the stones. When the grinding operation is completed, instead of releasing'the stones by a reverse movement controlled by the hand of the operator, the release is accomplished by pressing the button 43'which trips the detent 39 and permits the spring 30 to release the stones'by a. quick action.

In order that the cam 27 may remain stationary and hold the. grinder 21 away from the knife until after the grinder 20 has moved into contact therewith, the cam finger'27 has a limited rotary movement relative to the shaft 24. To produce this result the cam finger 27 is provided with a notch 75, as shown in F ig. 10, and a stop 76 is secured to the shaft 24 and operates in the. notch 75 to limit the movement of the cam finger 27 relative to the shaft. When the parts are in the position shown in Fig. 1 the end'of the cam finger 27 engages a groove 77 in the pin 29. As the shaft 24 isrotated in a counter-clockwise direction, as viewed in Fig. 1, the cam finger 27'wil1 remain stationary until the stop 76 has engaged thelower end of the notch 75. This permits the grinder 20 to engage the knife 11'. Further rotation of the shaft to shift the detent 39 from the notch 37 to the notch 38 in the ratchet wheel 34 will release the cam finger 27 from; the groove 77 and free the grinder'21 so that it moves inwardly into contact with the knife 11 to remove the burr therefrom.

After the release of the cam finger 27 from the notch 7 7 ,the action of the pin 29 and of gravity moves the cam finger 27 in a counterclockwise direction, as viewed in Fig. 1, to return'the finger to the position, relative to the shaft 24, shown-in Fig.;10. It will be noted from, Fig. 1 that the grinder 20 has a greater distance to move-before engaging the knife than has the grinder 21 so that the cam finger 27 will be separated from its pin 29 and upon reverse movement of theshaft will not reengagethe pin '29 until after the grinder 20 has been disengaged from the beveled edge of the knife. The slight interval between disengagement of the two grinders permits the portion of the periphery of the knife inter posed between the two grinders at the time the grinder 20 is removed to traverse the grinder 21 before its removal, thus insuring removal. of the burr from this small portion of the knife edge; The parts are so adjusted that V the' time elapsing between the withdrawal of the stones is sufficient to permit a point on the periphery of the blade 11 to travel from the stone 20 past the stone 21.

the removal of he stone the portion of the blade which is interposed between the two stones at the time the stone 20 is removed 49 on the nut 48 engages a notch in the end of the sleeve 46 to prevent accidental rotation of the nut 48. A lever 50 is pivoted at v51 on the socket member 47 and is provided with a tooth 52 which enters a slot 58 in the sleeve 46 and holds the sleeve 46 in position in the socket member 47. The socket member47 is mounted to slide horizontally on guide pins 54 and 55 which are supported by a flange 56 on the bearing 10. The member 47 is pro vided with a sleeve 57 which accurately fits the guide pin 54 while the pin 55 is engaged by bifurcations 58 which hold the socket member 47 from rotation about the pin 54 as an axis. The lower end of the sleeve 46 is provided with a stud 59 arranged to enter a recess 60 in the top of the bearing 10. A depression 61 is provided for receiving the bottom end of the stud 59 when the grinder.

is retracted away from the knife 11. It will be apparent that the grinder cannot be retracted so long as the housing 12 is in the position shown in Fig. 1. It is necessary to depress the lever 50 and raise the sle ve 46 and housing 12 at the same time releasing the stud 59 before the housing can be retracted. This lifting of the grinder by the lever 50 raises the stone 21 a sufficient distance to clear the edge of the knife 11 so that the knife cannot be injured by the movement of the grinder into its retracted position. Conversely the stones cannot be lowered on reverse move: ment of the grinder toward operative position until the stones are in position to clear the edge of the knife. If the housing should be raised and lowered while in its operative position, it is apparent that noinjury will be done so long as the stones are retracted, as shown in Fig. 1. If the hand wheel 32 should be rotated to bring the stones into operative position the edge of the knife would still he uninjured because of the relation which the stones bear to each other, as indicated in Fig.6. Lifting the stones would not injure the edge of the knife since in'this movement the stones would be withdrawn awayfrom theedge of the knife. The spindles 18 and 19 are so positioned that if the stones are projected they will take the position shown in Fig. 6 and if the casing 12 should be lowered while the stones are in this position, the stone 20 is first to engage the knife 11, and since this stone strikes the beveled face of the edge and not the sharpened portion, no injury is done-as would be the case if the stone 21 were positioned to-strike the edge of the knife first.

The height of the stones is regulated by the adjustment nut 48 by means of which the stones are adjusted to the proper position for grinding the edge of the knife. As the knife wears the housing 12 may be adjusted downwardlyby rotating thenut 48. When the stones are in proper relation to the knife depression of the lever 50 will impart sufiicient movement to the upper stone21 to raise it clear of the knife. This relation may be used for determining the proper adjustment of the nut 48. The operator may be instructed to depress the lever 50 and then rotate the nut 48 until the stone 21 clears the edge of the knife by a desired amount as, for

instance, a sixteenth of an inch. This will 1nsure proper posltion of the stones for grindin when? the lever '50 is released The adtal rotation-about the axis of the supporting pin 45 by means of a pin 62 projectingdownwardly from the housing 12 and extending through an opening 63in a lug 64 on thesleeve47. Adjustment screws 65 engage opposite faces of the pin 62 so that the angular position of the housing 12 may be accurately adjusted to aline the flat face of the grinder 21 with the plane of the cutting edge of the knife.

In the modification shown in F igs. 7 8 and 9, the support for the grinders is similar to that in the form already described, but adifferent form of ratchet mechanism for controlling the shaft'24 is employed. In this modificationthe hand wheel 66 is provided with a tooth 67 projecting into the housing in position to engage the teeth 68 and 69 on a disc 70-surrounding theshaft'24 and supportedby a spring 'Zl. It is apparent that the teeth 67, 6S and 69 form a ratchet mechanism which operate to hold the shaft 24 against rotation in a manner similar to the ratchet mechanism previously described. A push button. 72 is 'slidably mounted inthe case 73 i i position to engage the spring 71 and move it inwardly to releasethe shaft 24 for retracting the grinders. 7 i

In the form of the invention shown in Figs. 11 015, inclusive,the socket' member 47 is mounted for vertical adjustment. A thumb nut 84 is threaded on the post 83 and rests on the upper'end of the sleeve 46. By means of the thumb nut 84 the post 83 may be adjusted relative to the sleeve 46. A lever 85 is pivoted at86 in a slot formed in one side of the'socket 47 and is provided with a nosepiece 87 which engages a slot 88 in the sleeve 46. The lower-end of the "sleeve l6 carries a pin 89 arranged to rest in an opening 90 in the top of the bearing member 10. hen the lever 85 is depressed the pin '89 will be raised from the opening 90 so that the socket 47 may be slid along the guides 54 and 79 to move the grinder toward and away from the cutting plane of the knife, It will be apparent that the socket member 47 cannot be shifted. along the guides 54 and 79 until the sharpen-er has been lifted a sufficient amount to cause the grinder 21 to clear the edge of the: knife 11.1 Av depression 91 is provided for receiving the lower end of the pin 89 when the sharpener is withdrawn from theknife. A housing .92 is supported on the upper end of the post 83 and carries inwardly extending sleeves 93 and 94 in which bushings 95 and 96, respectively, are slidably mounted. A shaft 97 isjournaled in the bushing'95 and supports the grinder 20 at its forward end.

A shaft 98 is journaled in the bushing 96 and supports the grinder 21 at itsforward end. A spring 99 urges the bushing 95 and grinder 20 toward the knife lland a spring 100 tends to retract the bushing 96 and grinder 21 toward the other face of the knife 11. A pin 101 is secured to the bushing 95 and slides in aslot 102ii1the sleeve 93. Apin 103 is secured to the sleeve 96 and slides in a slot 104' in the sleeve 94. i

A shaft 105 is journaled in ears 106 and 107' on the sleeves 93 and 94, respectively. The shaft 105 carries a cam pin 108 which bears against the pin 101 to control the position of the grinder 20. A collar 109 is rotatably mounted on the shaft 105 and carries a cam pin 110 for engaging the pin 103. The pin 103 is provided with a peripheral notch 111 for receiving the point of the pm 110. The collar 109 has laterally projecting pins 112 and 113 which are angularly spaced relative to each other anda pin 114 projects radi ally from the shaft 105. between the pins 112 and. 113 to limit the rotationofv the collar 109 on the shaft 105. A hand wheel 115 is secured to the end of the shaft 105, as shown best in Fig. 11, and a spring 116 is attached at one the periphery thereof. A pawl 121 is pressed against the periphery ofthe ratchet wheel 118 by a spring 122 so that when the notches 119 or 120 register with the nose of the pawl 121 the pawl will engage the notchesand hold the ratchet wheel and shaft against rotation under the force of the spring 116. The pawl 121 .is pivotally mounted on a screw 123 which is supported by a lug 124 on the sleeve 93. A trip arm 125 is also pivotally mounted on the screw 123 and is provided with a nose-piece 126 which engages notches 127 in an upright bar 128. The bar 128 is pivoted at 129 in a slot 130 in the socket 47. A spring 131 presses the top end of the bar 128 toward the nose of the trip arm 125. The arm 125 carries a pin 132 which overlies the pawl 121.

When the parts are in the position shown in the drawings and it is desired to grind the knife 11, the hand wheel 115 is turned to rotate the shaft 105 in a clockwise direction, as viewed in Figs. 13 and 15, against the force of the spring 116. This will move the cam pin 108 upwardly and to the right and release the pin '101 so that the grinder 20 is moved forwardly the spring 99 into contact with the beveled 'edge of the knife 11. W hen the shaft 105 is rotated to bring the notch 119 into engagement with the pawl 121 the shaft will be held in this position so that by rotation of the knife 11 the edge of the knife will be sharpened by the grinder 20. The rotation of the shaft 105 to this extent does notaffect the sleeve 109 and the cam pin 110 since the pin 114 is merely moved in a clockwise direction to a point adjacent the pin 113. After the parts remain in this position. a sufiicient length of time to grind the knife the hand wheel 115 is given a slight ad ditional movement in the same direction as before to bring the notch 120 into engagement with the pawl 121. During this additional movement the pin 114 will engage the pin 113 and rotate'the collar 109 and cam pin 110 a sufficient amount to bring the pin 110 out of mesh with theperipheral groove 111 in the pin 103. This will free'the pin 103 so that the spring 100 will draw the grinder 21.

against the flat face of the knife in position to remove any burr formed by the grinder 20. The force of the pin 103 against the cam pin 110 and'the action of gravity will cause the sleeve 109 to rotate upon the shaft 105 until the pin 112 again engages the pin 114. The

knife. After the sharpening operation has been thus completed, it is only necessary for the operator to press down the lever 85 and withdraw the socket 47. When the lever 85 is operated the grinders will be withdrawn in the proper order from the knife 11 through the action of the trip arm 125 and bar 128. It will be apparent that when the sleeve 46 is lifted by the lever 85, the housing 92 will be carried upwardly, but the bar 128 willremain stationary. This will produce a relatively downward pull on the trip arm 125 which will cause the pin 182 to engage the pawl 121 and release the pawl from the ratchet wheel 118. The spring 116 will then operate to rotate the shaft 105'to the position shown in Figs. 12 and 13.

It will be seen from Fig. 12 that the grinder 20 is normally further removed :from the knife 11 than the grinder 21 so that at the time the grinders are placed into engagement with the knife the cam finger 110 will havea greater amount of rotation after itsgrinder 21 has been arrested by the knife 11 than will the cam finger 108 after-its grinder 20 has been arrested. Upon reverse movement of the shaft 105 therefore the grinder 20 will be picked up by its cam finger and withdrawn from contact with the knife 11 slightly in advance of the withdrawal of the grinder 21. This interval of time between the removal of the two grinders permits the portion ofthe periphery between the contact points of the two grinders to traverse the grinder 21 before the grinder 20 is removed. Ifthe two grind. ers were removed exactly simultaneously there would be a slight space on the, periphery of the knife froinwhich the burr formed by the grinder 20 would not have been removed by the grinder 21. It will be seen that the sharpener cannot be withdrawn from its position over the knife until the lever 85 has been.

depressed to raise the grinder 21 a sufiicient amount to clear the edge of the knife. :The same operation which lifts the "sharpener automatically, releases the sprin, ".-116' to.

withdraw the grinders in the proper order from contact with the edge ofthe knife.

It will be seen from Fig. 11 that the portion of the grinder 20 which engages the knife 11 is in alinement with the vertical radius V of the knife. As the knife is worn away, the

position of the sharpener maybe adjusted by rotating the thumb nut 84. Thiswill cause the contact portion of the grinder 20 to travel inwardly in a radial direction relative to the knife 11 so thatthe grinder, at its point of contact with" the knife, will always have the same relation, to the knife irrespecti'vely of the diameter of the knife. that the thumb nut 84' is held againstrotation by the bar 128 and'inforder torelea'se'the nut It will be noted for adjusting the vertical position-of the sharpener it is necessary to move the bar 128 to the left, as viewed in Fig. 12. This will free the trip arm. 125 from the teeth 127 so that the point of engagement between the trip arm 125 and the bar 128 will be adjusted to correspond to the new position of the sharpener. It is desirable to release the pawl 121 before the sharpener 21 is raised clear of the knife and for this reason it is desirable to maintain the-proper-position; of contact be tween the teeth 127 and the trip arm 125 corresponding to the adjustment of the sharpener by the nnt' 84. I The casing 92 is held against rotationabout the axis of the socket 47 by the bar 128. The bar 128 passes through a slot in the base of the casing and opposite sides of the bar are engaged by ad justable screws 133 which permit slight adjustment of the angular position of the casing 92 about the axis of the socket 47. i

When the housing-92 is in its retracted position it will be elevated because of the slight depth of the recess 91. In this position the control lever 125 will hold the pawl 121 out of engagement with the ratchet wheel 118 so that the spring 116 will hold the grinders in retracted position. If the hand wheel 115 is rotated to permit projection of the grind ers thev spring will immediately retract. them again upon release of the hand wheel. This prevents the grinders from being present in their projected position prior to lowering thereof toward the knife and'insures clearance space between the grinders and knife at that time so that the knife edge will not be injured by movement of the grinders downwardly toward the knife. -Iclaim: s 1. A sharpener for a slicing machine knife comprising a pair of grinders arranged to engage opposite sides of a knife to be sharpened,springs formoving said sharpener into engagement with said knife, cams for controllingthe movement of said Sharpeners to efiect a predetermined sequence of contact of said 'sharpeners with said knife, a spring for operating said cams to retract said sharpeners from engagement with said knife, a detent for holding saidspring inoperative, and means for 'releasings'aid .detent to permit quickretraction of said Sharpeners by said spring. i

.2. A'sharpener for a rotary circular slicing.

machine blade comprising a pair of grinders spaced.circumferentially of said blade from each other, a spring for retracting said grinders fromsaid blade, manualmeans'for oppos ing said spring to permit movement of said grinders into engagement with said blade, a detent for holding sald spring an positlon to permit said grinders to engage said blade,and

means for releasing saiddetenttopiermitquick withdrawal of said grinders from said blade under the influenceof saidspring, saidjspring 4. permit movement of the first-mentioned an s'inoperatiyie -position. on said -."support, 'a

being arranged to effect the withdrawal of said "grinders successively at'an interval of time sufficient to permit. thexportion of the blade lying between said grinders when the first grinder is Withdrawn to be traversed by the other grinder before its withdrawal.

J 3.;In a slicing machine having a rotary circular slicing knife and a support therefor,

; traction of said grinders ina direction transverseto the-edge of said knife. and parallel to the cutting plane thereof, a detent for preventing action of said retracting spring,and means for releasing said detent when saidgrinders are shifted vparallel tothe plane of said knife away from said lmife. A r

5; Ina slicing machine, a slicing knife having the. edge thereofvbeveled atone side, a grinder for engaging the bevelednside of said edge, a second grinder for engaging the op posite side of said edge, springs for'inoving said grinders toward said knife, a sup-port for said grinders, means formoving said sup port away from saidknife in a direction parallel. to the plane of said knife,-'a=sp-ring for retracting said grinders from-said knife transversely of the plane ofsaid knife, a member operated by said retracting spring and connecting said retracting spring with said grinders and havinglost-motion connec-' tion with the second-mentioned :grinder to grinder intoeontact witlrthebeveledside of saidiedge prior to'contact of the second-morn tion'ed grinder! with said: knifega detent for controlling said retracting spring, and means for releasing said detent when said grinder support is shifted in thedirection of the j planeof saidknife to permit withdrawal'of said grinders under the action of said retracting spring. and free from manual regulat on,

the connection between said retracting spring.

and grinders being arranged to effect withdrawalof said grinder-sin reverse orderfrom theirmovement i'nto engagementwith said hifelgfigr W Y 6.' In. a'isharpen'er for] slicing? machine knives asupport,.a grinder mounted on said support, "said. support being inovable into I and'out .of operative position relative to said knife, afspringifor moving said-j grinder into detent for holdin said springa'g ainst opera:

tion, and means for preventing operation of said detent when saidv support isin inoperative relation with said knife.

7. In aslicing machine having a slicing knife, a grinder disposedwhen in operative position on one side of said knife, a support for said grinder. on the other side of said knife, a guide upon which said support is comprising'a pair of grinderspone applied to one side of the knife edge to sharpen the knife and-the'other applied to the opposite edge. of the knife to remove the burr, means controlling the movement of. said grindersto effect the application of said grinders successively, a spring for retracting both of said grinders from engagement withsaid knife, ratchet mechanism having a plurality of positions of adjustment. for controlling said s rin to effect the a plicationof the sharp- P e P eninggrinder only-or the application of both of said grinders to said knife, and means for.

releasing said ratchet mechanism to permit said spring to effect quick withdrawalof said grinders from engagement with said knife.-

' 9. A sharpener for a slicing machine knife comprising a sharpening grinder and aburr removlng grinder, springs f for moving said grinders into engagement with the knife,cams for; withdrawing said grinders against the force of said springs,-a retractive spring for operating saidcams, ratchet mechanism'hav ing a plurality of positions of adjustment for controlling the positions of said cams to-effeet the application of the sharpening. grinder "alone or both of said grinders to said knife,

and meansifor releasing said ratchet'mechanlsm to perniitsaldretractive spring-to effect quick withdrawal of both+of said grinders from engagement with said knife.

"10.- A sharpener for a slicing-machine knife comprising a .pair i of. grinders, springs for moving said grinders into contact with the opposite portions of said knife, a retractive sprin of'greater effective force, than both of said rst mentionedsprings combined and-arrangedto operate against the combinedforcesj of said'first-mentioned springs to retract said grinders from engagement with "said knife, ratchet mechanism for controllingsaid retractive spring toYhold-one or.both ofsaid grinds ersin engagement with said knife, means for chine knifabf a; sharpener for said'knife dis releasing said'ratchetmechanism, and-mechaposed atone side of said knife when in operative position, means for guiding said sharps ener toward and from said knife along rectilinear lines parallel to the axis of the knife, means for elevating the sharpener while being moved toward said knife and moved down into operative relation with said knife when released, and means for efiecting the application of the sharpener to the knife.

12. The combination with a slicing machine knife, of a sharpener comprising a pair, of grinders adapted to be disposed on opposite sides of the cutting edge of the knife, means for guiding the sharpeneras a unit toward and away from the edgeof the knife along the rectilinear lines at right angles to the cutting plane of the knife, means for lifting the sharpener while it is being moved toward the knife so as to enable one of the grinders to clear the edge of re knife as it moves over and beyond the same, and means for effecting the application of the grinders to the knife after being brought into operative relation therewith.

18. The combination with a slicing machine knife, of asharpener comprising a sharpening grinder and a burr removing grinder, means for moving said sharpener into and out of operative relation with said knife, means comprising a manually actuated device for elevating the sharpener during its movement toward operative position to enable the burr removing grin'derto clear the edge of the knife and move into operative relation with l as combination with a rotary circular knife, a guide for said sharpener to di'rect'the same into and out of operative relation with said knife along rectilinear lines parallel to the axis of the knife, means for holding said sharpener at such a predetermined radial dis tance from the axis of said knife asto prevent the sharpener from engaging the knife while being moved into or out of operative relation therewith, and means for'holding the sharpener in operative relation with said knife.

lar slicing machine knife,ofa sharpener for sorting said sharpener for movement toward rpener in its operative and inoperative pon r machine knife, ofa sharpener forsai'd 16. The combination with a rotarycircusaid knife, a: support for said sharpener com-' prislngguides on which said sharpener may 1 slicing machine knife, of a sharpener for said knife,telesc0ping members for supporting said sharpener, means for extending said telescoping members to vary the pos1t1on of said sharpener relative to said knife, and means comprlslng a lever for manually moving said telescoping members as a unit along rectilinear lines without changing their relative adjustment to move-said sharpener along rectilinear lines radially with respect to said slicing machine knife. 1 '1' 18; The combination with a rotary circular slicing machine knife, of a sharpener for said knife, a support, an extensible connection between'said support/and said sharpener, means for adjusting said connection to adjust the position of said sharpener, means to prevent rotation of said sharpener relatively to said support, and a lever pivoted to said support for moving said connection relatively to said support along rectilinear lines to efiect rectilinear movement of said sharpener radially with respect to said circu lar slicing maehineknife. c

19. The combination with a slicing ma chine knife having a beveled edge, of an inclinedsharpening grinder adapted to be applied to said beveled edge, a second grinder adapted to be appliedto the opposite edge ofthe knife, means controlled by arotary knob for effecting theapplieation 0f the sharpening grinder, and burr removing, grinder to the knife successively, and means operated by a push button for automatically removing the sharpening grinder and the burr removinggrinder successively from'engagement with the l V 20. The combination'with a rotary circular slicing machine knife having a beveled edge, of a sharpening grinder adapted to occupy an inclined position adjacent the said beveled edge, a second grinderadjacent the opposite edge of the knife, means for supporting said grinders for movement toward and from the knife, means controlled by arotary 'knob for; effecting the application of the grinders to the knife, and mechanismoperable independently of the rotation of said knob for. automatically releasing the burr removing grinderfrom engagement v with the-knife successively toeffect the application of the'burr ire-moving grinde'rlto the knife for a short intervalafter the 're moval of the sharpening grinder. T

'5 21. A sharpener for a rotary slicingmachine knife blade :comprising 7 a pair of grinders, means forsupportingsaid grinders in" operative relation to thecutting edge of the blade at opposite sides thereof and 51? spaced apart circumferentially with respect to said circular slicingmachineblade, means for effecting the application of said grinders to the cutting edge of said blade, and mechanism'for freeing saidgrinders from said Szblade successively with a predetermined intervening interval to afford the grinder last freed the opportunity to remove the burr from that portion of the blade between the grinders at the time the first gr'inderfiis free.

22. In a slicing machine, the combination with a slicing knife, of a support therefor, a sharpener for said knife comprising a pair 7 of grinders and a grinder support, adjustable mechanism for mountingsaid' 'grinder supporton said knifesupport at adjusted radial distance of the grinder support from said knife support, a. bar connected between said knife supportand said-- grinder support to prevent rotation of thesharpener' relatively totheknife support, and means for securing said bar in position tohold the grinders at adjusted radial distance from the axis of the knife. l r v 23. In a slicing machine having a circular '5 knife and a-supp'ortrtherefor, the-combina tion with a sharpener for said'knife comprising a grinder adapted. to engflge the pe riphery of sa-id knife, of means for mounting said sharpener on'saidzsupport for adsaid knife, a spring for retractingsaid grinders from engagement with said knife-ratchet mechanism having, a plurality of positionsof adjustment forholding oneoi'v both of said grinders 11'1"C(n'ltfflji] w th said knife, and V meanslfor releas ngsaid'ratchet mechanism" drawal of the grinder; or; grinders f igagementuwith said knife. j i

Y 25. In a slicingzjmachine, the combination with a slicin knife of a shar enin rinderf a burr removing grinder; means for shifting,

,said grinder successively intoicontact with said knife by movement,tigansversely to tlie just-ment of the-sharpener radially relative to to cause said: spring to effect quick -with-, :rom en planeof'said knife, means for'shifting said grinders away from said knife in a direction parallel to the plane of said knife, and means acting automatically when said grinders are moved away from said knife in a direction parallel to the piano of said knife to move the said grinders out of contact with said knife transversely to the plane of said knife and in reverse order from their movement into contact with said knife to cause the burr removing grinder to remain in contact with the fe short interval of time after the sharpening-grinder has been removed. e

'26. In a slicing machine, the combination with a slicing knife having a beveled edge, of a sharpenin'ggrinder movable into contact with the beveled side of said edge, a burr removing grinder for engaging the opposite side of said edge, and cam-controlled springs for moving said grinders into and out of engagement with said knife, arranged to bring thesharpening-grinder into contact with the beveled edge while the other grinder is out of engagement with said knife and to effect withdrawal of said grinders from said knife in reverse order to their movement into engagement therewith, to cause the burr removing grinder'to remain in contact a short interval of time after the sharpening grinder has been removed, the withdrawal of said grinders being reflected by spring movement independent of manual regulation.

27. In a sharpener for the rotary knife of a slicing machine, the combination with a supporting base havinga recess therein, of a supporting element having a tubular guidewa-y thereimmeans connecting said supporting element to said supporting base for sliding movement relatively thereto in a direction substantially parallel to the axis of the knife of the slicing machine, a sharpener, an auxiliary supportfor said sharpener extend-- ing into said tubular guideway, a projection onthc inner end of said auxiliary support adapted to fit into said recess to hold said supporting element together with said auxiliary support and said sharpener in a predetermined. position relative to the knife of the slicing machine, and means for preventing rotation of the sharpener relative to said supporting element. v

'28. In a slicing machine, the'combination with a knife sharpener,of a support, a cylindrical guideway in said'support, a screwthreaded stud secured to said sharpener, a

sleeve'fitti'ng in said guideway for rotation therein and having internal screw threads meshingwith the screw threads on said stud, a knurledheadon said sleeve to turn the same on said studtolift or lower the latter and thereby ust' the position of said sharpener, and meansfOr guidingthe up and-down movements of the sharpener.

29; In a slicing'inachine,the-combination with a sharpener for, t the slicing machine? knife, of a pedestal for supporting said sharpener, means for guiding the pedestal along lines parallelto the axis of the knife, and means for extending the pedestal to move the sharpener radially away from the axis of the knife while the sharpener is being moved toward its operative position in relation to the knife.

30. In a slicing machine, the combination with a supporting base, of a sharpener for l the knife of the slicing machine, an extensible pedestal connected to said sharpener, guid ing mechanism between said pedestal and said supporting base, a lever for extending said pedestal to move the sharpener into position to clear the knife while the sharpener is being moved to and from its operative position in relation to the knife, and means coacting with said guiding mechanism and said pedestal for preventing contact of the sharpener with the lmife except when brought into operative relation therewith.

In testimony whereof I have signed my name to this specification on this 5th day of May, A. D. 1927.

JOHN N. WOODINGTON. 

